Scheduled removal of CompilationConfig.use_inductor (#29323)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/config/compilation.py

@@ -264,7 +264,6 @@ class CompilationConfig:
         - [`cudagraph_copy_inputs`]
         [vllm.config.CompilationConfig.cudagraph_copy_inputs]
     - Inductor compilation:
-        - [`use_inductor`][vllm.config.CompilationConfig.use_inductor]
         - [`compile_sizes`][vllm.config.CompilationConfig.compile_sizes]
         - [`inductor_compile_config`]
         [vllm.config.CompilationConfig.inductor_compile_config]
@@ -348,7 +347,7 @@ class CompilationConfig:
     - 'none,+op1,+op2' to enable only op1 and op2
 
     By default, all custom ops are enabled when running without Inductor and
-    disabled when running with Inductor: mode>=VLLM_COMPILE and use_inductor=True.
+    disabled when running with Inductor: mode>=VLLM_COMPILE and backend="inductor".
     Inductor generates (fused) Triton kernels for disabled custom ops."""
     splitting_ops: list[str] | None = None
     """A list of ops to exclude from cudagraphs, used in piecewise compilation.
@@ -374,24 +373,6 @@ class CompilationConfig:
     Disabled by default until more models are supported/tested to work."""
 
     # Inductor capture
-    use_inductor: bool | None = None
-    """
-    Whether to use inductor compilation.
-
-    This flag is deprecated and will be removed in the next release 0.12.0.
-    Please use the 'backend' option instead.
-
-    - False: inductor compilation is not used. graph runs in eager
-        (custom_ops enabled by default).
-    - True: inductor compilation is used (custom_ops disabled by default).
-        One graph for symbolic shape and one graph per size in compile_sizes
-        are compiled using configurations in inductor_compile_config.
-
-    This setting is ignored if mode<VLLM_COMPILE.
-
-    For future compatibility:
-    If use_inductor is True, backend="inductor" otherwise backend="eager".
-    """
     compile_sizes: list[int | str] | None = None
     """Sizes to compile for inductor. In addition
     to integers, it also supports "cudagraph_capture_sizes" to
@@ -759,14 +740,6 @@ class CompilationConfig:
                 f"Invalid backend for piecewise compilation: {self.backend}"
             )
 
-        if self.use_inductor is not None:
-            logger.warning_once(
-                "The 'use_inductor' flag is deprecated and will be "
-                "removed in the next release (v0.12.0). "
-                "Please use the 'backend' option instead.",
-            )
-            self.backend = "inductor" if self.use_inductor else "eager"
-
         if self.backend == "":
             self.backend = current_platform.get_compile_backend()